Can access QQ, but cannot access the Internet.

1. Virus Infection

This often occurs when you open ie. In the lower-left dialog box of the IE interface, the system prompts that the webpage is being opened, but the webpage does not respond for a long time. Check the process in the Task Manager (enter the method, place the mouse on the taskbar, right-click the Task Manager-process) to see how the CPU usage is. If it is 100%, you can be sure, is infected with a virus, and you want to run otherProgramIt is simply suffering. Check which process occupies CPU resources greedily.

After finding it, you 'd better record the name and click "end". If it cannot be completed, you need to start to secure mode to delete the stuff and enter the Registry. (method: start-run, enter Regedit) in the Registry dialog box, click Edit-search, enter the program name, find it, right-click to delete it, And then perform several searches, it can often be completely deleted.

There are a lot of viruses. When anti-virus software is powerless, the only way is to manually delete them.

2. related to setting proxy servers

In some cases, the proxy server (control panel -- Internet option-connection-LAN Settings-use proxy server for LAN) is set in the browser ), setting the proxy server does not affect QQ's network connection, because QQ uses port 4000 and port 80 or 8080 to access the Internet. This is why many people do not understand why QQ can be accessed, but web pages cannot be opened. The proxy server is generally not very stable, sometimes it can be accessed, sometimes it cannot. If so, cancel the proxy.

Iii. DNS server explanation Error

Domain Name Server (DNS) converts a domain name to an IP address that can be recognized by a computer, for example, www.sz.net.cn on the Shenzhen window. The IP address is 219.133.46.54, and www.szonline.net on the Shenzhen hotline) the corresponding IP address is 202.96.154.6. If an error occurs on the DNS server, the domain name cannot be interpreted. Naturally, the Internet cannot be accessed.
If this is the case, sometimes it is a problem with the network service access provider (ISP), you can call the ISP. Sometimes it is a problem with the vro or network card and cannot be connected to the DNS Service of the ISP.

In this case, you can turn the vro off for a while, or reset the vro. Or the network adapter cannot automatically find the DNS server address. You can try to use the specified DNS server address. In the network properties, (Control Panel-network and dial-up connections-local connection-right-click Properties-TCP/IP protocol-properties-use the following DNS server address ). Different ISPs have different DNS addresses. For example, China Telecom usually uses 202.96.134.133 (master) 202.96.128.68 (Backup ).

Updating the NIC driver or changing the NIC is also an idea.

Iv. Failure to start IE due to loss of system files

This phenomenon is quite common because:

1. system instability is manifested in frequent crashes, frequent inexplicable restarts, and illegal shutdown, leading to loss of system files;

2. Hardware and Software conflicts often occur when some programs are installed, causing NIC Driver conflicts or IE conflicts. Since Intel introduced hyper-threading CPU, an outstanding problem is that IE6 in XP SP1 conflicts with hyper-threading;

3. Virus intrusion causes damage or loss of system files.

In the first case, you can try to repair the system. In the 2 K or XP system, place the original installation disc (Note: The original installation disc must be used), and enter SFC/scanow in the Start-run mode, press enter. 98 systems can also be checked using the SFC command.

In the second case, You Can unmount the recently installed hardware or program. 2 K or XP systems can press F8 after the machine is started to enter the Start Menu, select "Last correct configuration". If it is an XP system, you can also use the restoration function of the system to solve the problem quickly.

If the XP system is caused by hyper-threading CPU, you can disable hyper-threading In the BIOS or upgrade to SP2. (Of course, upgrading SP2 in XP involves a lot of knowledge and precautions, which will not be detailed here ). In this case, the ttbrowser that comes with QQ can be browsed normally. You can try it again.

In the third case, the system disk should be thoroughly scanned for viruses.

Another phenomenon also needs to be paid special attention: You can open the homepage of the website, but you cannot open the second-level link. If so, you can re-register the following DLL file:

Enter:
Regsvr32 shdocvw. dll
Regsvr32 shell32.dll (note that you do not need to enter this command First)
Regsvr32 oleaut32.dll
Regsvr32 actxprxy. dll
Regsvr32 mshtml. dll
Regsvr32 urlmon. dll
Regsvr32 msjava. dll
Regsvr32 browseui. dll

Note: Press ENTER for each entry. The second command does not need to be input. After these commands are input, restart Windows. If it is invalid, enter the second command again.

5. Damaged IE

If none of the above methods works, it may be that the kernel of IE is damaged. Although the system has been repaired and cannot be compensated, reinstalling IE is the best method.

For 98 or 2 k systems, if the IE version is 5.0, we recommend that you upgrade it to 6.0.

If 6.0 has been installed on the 98 system, click Add/delete programs in the control panel. A repair dialog box is displayed. Select the default repair and restart.

If it is a 2 K + ie6.0 or XP (the built-in IE is 6.0) system, re-ie is a little troublesome, there are two ways:
1. Open the registry, expand HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Active Setup \ Installed Components \ {89820200-ecbd-11cf-8b85-00aa005b4383}, and change the isinstalled DWORD value to 0;
2. Open the Windows XP installation disc and enter the “rundll32.exe setupapi and installhinfsection defaultinstall 132% WINDIR % \ INF \ IE. inf "at the start of the installation"

Note: reinstalling IE does not necessarily solve the problem. It is just a solution.